ESN

1. Emergency Service Number A three-digit number that is assigned to the caller's telephone number in the tandem office translations. The emergency...

TN

Telephone Number. Unique combination of ten digits that identifies the equipment used to place and receive calls.

NANP

North American Numbering Plan. The numbering plan for the Public Switched Telephone Network for Canada, the US, and its territories, and the...

NENA

National Emergency Number Association. A USA‐specific organization of 9‐1‐1 service providers. Nena i3: Next Generation 9‐1‐1 standard developed by...